The Achto Teralith Helmet is a level 90 Melee tank head slot item, part of the Achto Teralith equipment set. It is a rare drop from Raids bosses, and owning the normal Teralith Helmet doubles the chance of getting the drop. Besides Daemonheim-only armour, it offers the best defensive bonuses for any item in its slot, tied with other Raids equipment.

When wearing three or more pieces of Achto or the normal Teralith armour, or a combination of the two, there is a 2% chance per piece that all of your Defence abilities will have their cooldowns reset, as long as at least three of the set pieces are worn. When this happens, there is a 1 minute cooldown before they can be reset again.

The Achto version has an additional effect if a shield is worn; as long as the weapon and the shield's combat styles match, each worn Achto armour piece boosts the weapon style's strength bonus by 10% of the weapon damage of an off-hand weapon of the shield's tier. If a defender is worn, the bonus is half of that. When calculating the strength bonus for the melee style, the off-hand weapon's damage is assumed to be that of a weapon with an attack speed similar to the main hand's.

For example, if a tier 90 melee shield is worn together with a main hand melee weapon with Fastest attack speed and four Achto Teralith armour pieces, then 40% of a tier 90 off-hand weapon's damage is applied as a Strength Bonus, i.e. 172. The effect applies with any number of Achto armour pieces, but if multiple different sets are used, only the set's effects are applied which has the highest number of pieces worn.

If you die in the Wilderness with the Achto Teralith Helmet, it will drop 8,400,000 coins instead of the item.

Raids equipment degrades as it is used outside of raids. Equipment received from the raids is fully repaired and can be used for 100,000 charges of combat (minimum time around 17 hours) until it degrades completely and requires repair before it can be used again; it does not suffer in performance as it degrades from fully repaired to fully degraded. The remaining charges of raids equipment can be checked by right-clicking it and selecting 'check-charge'. Items lose 20% charge if reclaimed from a gravestone after dying.

There are two ways to repair raids armour. Players can talk to any of the NPCs listed below and they will repair the items for a price in coins, or they can repair the pieces themselves using an armour stand in any player-owned house for a reduced cost based on their Smithing level. (While the newspost states that teci can be used, this is not the case.) The equipment can be repaired at any stage, and the cost will be adjusted according to how much it has degraded. The repair costs below are as if the equipment has fully degraded.

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